A circuit breaker drive mechanism

Abstract

The application discloses a circuit breaker transmission mechanism, comprising a support, a second lock catch, a jump catch, a lever, an upper connecting rod, a lower connecting rod, a rotating shaft and a first lock catch which are rotatably installed on the support; one end of the upper connecting rod is hingedly connected with one end of the lower connecting rod through an upper connecting rod shaft, the other end of the upper connecting rod is rotatably connected with the jump catch, and the other end of the lower connecting rod is hingedly connected with the rotating shaft through a lower connecting rod shaft; one end of a tension spring is connected with the lever, and the other end of the tension spring is connected with the upper connecting rod shaft; the jump catch, the first lock catch and the second lock catch form a three-stage mechanical transmission path in a locked state. The circuit breaker transmission mechanism realizes the front and rear contact opening and closing to increase the arc-extinguishing space through structural innovation, and greatly improves the opening and closing position precision and the action reliability through the integrated limiting structure, the three-stage locking structure and the over-dead-point connecting rod design.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, specifically to a circuit breaker transmission mechanism. Background Technology

[0002] Circuit breakers are widely used protective electrical devices in power systems, capable of closing, carrying, and interrupting current under normal or abnormal circuit conditions. As the core component of a circuit breaker, the transmission mechanism's function and reliability directly determine the overall performance and protective capability of the circuit breaker. With the increasing trend of circuit breakers developing towards higher voltage and larger capacity, higher technical requirements are placed on the transmission mechanism's opening and closing position accuracy, load clamping vibration resistance reliability, and arc extinguishing capability. However, existing circuit breaker transmission mechanisms still face several technical bottlenecks in these areas, mainly in the following aspects: Firstly, regarding arc-extinguishing capability, in existing circuit breaker drive mechanisms, the opening and closing movements of the moving contacts mostly occur along the height of the circuit breaker. This layout directly results in the effective height of the arc-extinguishing chamber being strictly limited by the product's external dimensions, making it difficult to further expand the arc-extinguishing space. In high-voltage breaking applications, insufficient contact spacing will severely affect the dielectric recovery strength and arc cooling effect of the arc-extinguishing chamber, making it increasingly difficult for traditional mechanisms to meet the breaking requirements of high-voltage levels.

[0003] Secondly, regarding the accuracy of the opening and closing positions, the rotating shaft is a key actuator that directly drives the moving contacts to achieve the opening and closing actions. Its positional accuracy directly determines the contact state between the moving and stationary contacts, thus affecting the current-carrying performance and breaking capacity of the circuit breaker. In traditional transmission mechanisms, there are usually two ways to limit the rotation of the rotating shaft: one is to add an independent limit block outside the bracket to directly limit the rotation angle of the rotating shaft. This method increases the number of parts and assembly steps, and the additional assembly tolerances introduced actually reduce the limiting accuracy; the other is to rely on the limit position of the linkage mechanism itself for limiting, but this method is greatly affected by the machining tolerances of each linkage part and the cumulative assembly errors, making it difficult to accurately guarantee the actual stopping position of the rotating shaft. In high-voltage circuit breakers, inaccurate opening positions will lead to insufficient contact gap, affecting the arc-extinguishing capability; inaccurate closing positions will lead to insufficient or unstable contact pressure, causing contact overheating or even welding accidents, seriously affecting the current-carrying performance and service life of the circuit breaker.

[0004] Secondly, regarding the reliability of the tripping mechanism, it is the core safety component in the transmission mechanism, and its operational reliability directly affects the protection performance of the circuit breaker and the safety of the power grid. Traditional circuit breaker tripping mechanisms generally adopt a single-stage locking structure, meaning that the tripping state is maintained by only one locking part directly engaging with the tripping clip. This single-stage locking structure has significant technical defects: poor vibration resistance; when the circuit breaker is subjected to external vibration or mechanical impact, the single-stage locking is prone to accidental slippage, leading to malfunction; insufficient tripping reliability; the limited overlap area of ​​the single-stage locking means there is a risk of tripping failure due to wear or deformation of parts under high voltage and high current conditions; and a single mechanical transmission path lacking redundancy, meaning that once the locking part wears or undergoes plastic deformation, the protection function of the entire tripping mechanism will be significantly reduced.

[0005] Furthermore, regarding the support structure, traditional transmission mechanisms often employ one-piece casting or stamping. While this results in high overall strength, the molds are complex, manufacturing costs are high, and it's difficult to guarantee high precision in machining the limiting surfaces and rotation centers of the moving parts on the support, easily leading to cumulative tolerances. Some supports with split structures have complex connection methods between components and lack specialized limiting designs for different moving parts, resulting in poor consistency in the transmission mechanism's movements and making it difficult to meet the stringent requirements of high-voltage circuit breakers for assembly accuracy and long-term operational stability.

[0006] In summary, existing circuit breaker drive mechanisms face pressing technical challenges in areas such as arc-extinguishing space layout, precise control of opening and closing positions, vibration resistance reliability of the load catch, and integrated support design. Therefore, providing a circuit breaker drive mechanism that can both expand the arc-extinguishing space to accommodate high-voltage breaking requirements and ensure high precision in opening and closing positions and high reliability in load catch operation has become a key technical issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a circuit breaker transmission mechanism. This mechanism achieves contact opening and closing through structural innovation to increase the arc extinguishing space. Furthermore, through an integrated limit structure, a three-level locking structure, and a dead-point linkage design, it significantly improves the accuracy of opening and closing positions and the reliability of operation.

[0008] This application provides a circuit breaker drive mechanism, including: The bracket includes a second latch, a jumper, a lever, an upper connecting rod, a lower connecting rod, a rotating shaft, and a first latch, all rotatably mounted on the bracket. One end of the upper connecting rod is hinged to one end of the lower connecting rod via an upper connecting rod shaft, the other end of the upper connecting rod is rotatably connected to the jumper, and the other end of the lower connecting rod is hinged to the rotating shaft via a lower connecting rod shaft. A tension spring, one end of which is connected to the lever and the other end of which is connected to the upper connecting rod shaft; The jump buckle, the first locking buckle, and the second locking buckle form a three-level sequential locking mechanical transmission path in the loaded state, wherein: The first buckle overlap surface of the jump buckle abuts against the second buckle overlap surface of the first lock buckle to form a first-level lock; The second latching surface of the first latch abuts against the first latching surface of the second latch to form a second level of locking; The first buckle limiting surface of the second buckle abuts against the second buckle limiting surface on the bracket to form a third level of locking.

[0009] In one embodiment of this application, the bracket includes a first side plate, a second side plate, and a connecting shaft connecting the two. The bracket integrates multiple limiting surfaces for limiting the movement of a component. These multiple limiting surfaces include: The first lower connecting rod shaft limiting surface and the second lower connecting rod shaft limiting surface, which are disposed on the first side plate and the second side plate respectively, abut against the first lower connecting rod shaft limiting surface and the second lower connecting rod shaft limiting surface when the tripped state is engaged, thereby limiting the tripping limit position of the rotating shaft.

[0010] In one embodiment of this application, the plurality of limiting surfaces further include: The second closing limit surface, which is provided on the lower connecting rod, abuts against the connecting shaft of the bracket in the closed state to limit the closing limit position of the rotating shaft.

[0011] In one embodiment of this application, the plurality of limiting surfaces further include: The first lever closing limit surface and the second lever closing limit surface are disposed on the first side plate and the second side plate, respectively. In the closed state, the first closing limit surface of the lever abuts against the first lever closing limit surface and the second lever closing limit surface.

[0012] In one embodiment of this application, the plurality of limiting surfaces further include: A first jump buckle limiting surface and a second jump buckle limiting surface are provided on the first side plate and the second side plate, and a third jump buckle limiting surface is provided on the jump buckle to abut against the first jump buckle limiting surface and the second jump buckle limiting surface to limit the initial position of the jump buckle.

[0013] In one embodiment of this application, the jump buckle is provided with a lever contact surface for abutting against the lever and receiving the lever driving force; During the closing process, the lever drives the tension spring to move, causing the center line D of the tension spring to cross the line C connecting the rotation center of the upper connecting rod and the third mounting hole, thereby providing the tension of the tension spring with a continuous torque to maintain the closed state for the upper and lower connecting rods.

[0014] In one embodiment of this application, a first lever left and right limiting block is provided on the first side plate, and a second lever left and right limiting block is provided on the second side plate. The lever is rotatably installed between the first side plate and the second side plate and is limited between the first lever left and right limiting block and the second lever left and right limiting block.

[0015] In one embodiment of this application, the second side plate is further provided with a second latch limiting surface two adapted to the second latch. The second latch limiting surface one and the second latch limiting surface two are respectively used to limit the rotation limits of the second latch in two directions.

[0016] In one embodiment of this application, the jump buckle is further provided with a first buckle driving surface, and the first buckle is provided with a buckle driving surface; During the fastening process, the lever drives the buckle to rotate, and the first buckle driving surface abuts against the fastening driving surface to drive the first buckle to rotate, causing the second buckle lap surface of the first buckle to move to a position higher than the first buckle lap surface of the second buckle.

[0017] In one embodiment of this application, a first torsion spring and a second torsion spring are also included; The first latch is rotatably mounted on the bracket via the first latch shaft; the first torsion spring is sleeved on the first latch shaft, the fixing arm of one end of the first torsion spring abuts against the torsion spring limiting hole provided on the bracket, and the applying arm of the other end abuts against the torsion spring overlapping surface provided on the first latch, so as to drive the first latch to rotate. The second latch is rotatably mounted on the bracket via the second latch shaft; the second torsion spring is sleeved on the second latch shaft, and the fixing arm of one end of the second torsion spring overlaps the limiting surface provided by the bracket, while the applying arm of the other end overlaps the torsion spring applying arm positioning overlap surface provided by the second latch, so as to drive the second latch to rotate. A moving contact is provided on the rotating shaft. The moving contact swings between the open and closed positions with the rotating shaft. The opening and closing movement direction of the moving contact is arranged along the length of the arc-extinguishing space of the circuit breaker.

[0018] The beneficial effects of this application are: Firstly, regarding the reliability of the tripping mechanism, this application fundamentally overcomes the inherent defects of traditional single-stage locking structures, such as poor vibration resistance and susceptibility to unexpected tripping, by constructing a three-level mechanical transmission path consisting of a jump latch, a first locking latch, and a second locking latch locked sequentially. This three-level locking mechanism provides effective redundancy; even if one locking pair loosens due to long-term wear or accidental vibration, the other two locking levels can still maintain a stable latching state, resulting in an exponential increase in the overall reliability of the mechanism rather than a simple additive improvement. Simultaneously, the interlocking structure of the three-level locking significantly extends the path of external vibration energy to the tripping point, enhances system damping, and effectively attenuates the disturbance of external impacts on the locking state, thus exhibiting excellent vibration resistance. Furthermore, this structure clearly defines the force transmission routes of the jump latch, the first locking latch, the second locking latch, and the support, providing a clear mechanical model that facilitates engineering design and fault analysis.

[0019] Secondly, regarding the improvement of arc-extinguishing capability, this application optimizes the motion trajectory of the four-bar linkage, planning the opening and closing motion direction of the moving contact to proceed along the length of the arc-extinguishing space of the circuit breaker. This layout overcomes the technical bottleneck of traditional mechanisms where the effective space of the arc-extinguishing chamber is strictly limited by the product's external dimensions due to movement along the height direction. This allows the arc-extinguishing space to be fully extended in the length direction, thus achieving a larger contact gap under the same external dimension constraints. The larger gap provides more space and time for arc elongation, cooling, and extinguishing, significantly enhancing the dielectric recovery strength of the arc-extinguishing chamber. This enables the product to reliably handle higher voltage levels and larger capacity breaking conditions, aligning with the industry trend of circuit breakers developing towards higher voltage and larger capacity.

[0020] Furthermore, regarding the accuracy control of the opening and closing positions, this application completely changes the problems of insufficient accuracy and poor stability caused by traditional technologies that rely on external independent parts for limiting or simply on the movement limits of the linkage mechanism itself, by integrating multiple key limiting surfaces onto the side plate of the combined bracket and using a specific linkage limiting structure. In the opening state, the stored capacity of the tension spring is used to firmly press the lower linkage shaft against the lower linkage shaft limiting surface integrally machined on the side plate, eliminating the cumulative assembly errors of independent limiting parts and ensuring high repeatability of the shaft opening position and precise stability of the contact opening distance. In the closing state, the specially designed closing limiting surface on the lower linkage directly abuts against the connecting shaft of the bracket. The connecting shaft has both structural connection and closing positioning functions, with good rigidity and accurate positioning, effectively controlling the closing limit position and suppressing contact bounce during the closing process. Thanks to the high-precision limit switches at both the opening and closing ends, the contact pressure between the moving and stationary contacts can be precisely preset and remain highly consistent during long-term operation. This effectively avoids overheating and welding caused by poor contact, or abnormal wear caused by excessive pressure, significantly improving the circuit breaker's current-carrying performance and service life. Simultaneously, since all limit references are integrated into the rigid support body, the risk of limit reference drift due to transportation or operation is fundamentally eliminated, ensuring consistent operation and maintenance-free characteristics throughout the product's entire lifecycle.

[0021] Furthermore, this application innovatively utilizes the characteristic of a sudden change in the direction of tension when the tension spring passes the "dead point" position, providing a continuous and stable self-holding torque for the closing state. This design eliminates the need for additional complex closing latches or levers, greatly simplifying the structure and assembly complexity of the mechanism components. After passing the dead point, the torque generated by the tension spring stably presses the upper and lower connecting rods towards the closing limit position. This continuous torque effectively counteracts the electro-repulsive force and mechanical bounce generated at the moment of contact between the moving and stationary contacts, ensuring a smooth closing process and reliable contact.

[0022] Finally, regarding the support structure and manufacturing, the combined side plate support solution adopted in this application also brings significant comprehensive benefits. The first and second side plates can be formed separately by precision stamping or machining. The rotary shaft holes and various limiting functional surfaces on them can be processed in a single process, with extremely high relative positional accuracy, effectively avoiding the cumulative tolerance problem caused by multiple processes in traditional one-piece cast supports. The side plate also integrates multiple functions such as a rotation center, multiple limiting surfaces, torsion spring fixing structure, and left and right limiting blocks, making it multi-functional and significantly reducing the total number of parts in the transmission mechanism, making the overall structure more compact and lightweight. From a manufacturing cost perspective, the side plate can be produced using a highly efficient standardized stamping process, and components such as connecting shafts are easy to process or can directly use standard parts, significantly reducing mold complexity and material costs, achieving better economy while ensuring high performance.

[0023] In summary, the circuit breaker transmission mechanism provided in this application has achieved breakthrough improvements in arc extinguishing space expansion, opening and closing position accuracy control, closing self-holding mechanism, load clamp vibration resistance reliability, and integrated bracket design, and has good engineering application prospects and industrial value. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the tripped state of the circuit breaker drive mechanism in this application. Figure 2 This is an exploded view of the circuit breaker drive mechanism of this application; Figure 3 This is an exploded view of the stent in this application; Figure 4 This is a schematic diagram of the first side panel of this application; Figure 5 This is a schematic diagram of the second side plate of this application; Figure 6 This is a schematic diagram of the second locking mechanism in this application; Figure 7 This is a schematic diagram of the jump shot in this application; Figure 8 This is a schematic diagram of the lever in this application; Figure 9 This is a schematic diagram of the lower connecting rod of this application; Figure 10 This is a schematic diagram of the rotating shaft in this application; Figure 11 This is a schematic diagram of the upper connecting rod of this application; Figure 12 This is a schematic diagram of the first locking mechanism in this application; Figure 13 This is a schematic diagram showing the installation details of the component at one of the angles of the tripping position in this application; Figure 14 This is a schematic diagram of the lower connecting rod, upper connecting rod shaft, and upper connecting rod installation in this application; Figure 15 This is a schematic diagram showing the installation details of the component at another angle of the tripping position in this application; Figure 16 This is a schematic diagram showing the installation details of the component at another angle of the tripping position in this application; Figure 17 This is a schematic diagram showing the internal details of the load limit in this application; Figure 18 This is a schematic diagram showing the external details of the load limit in this application; Figure 19 This is a schematic diagram of the loading and unloading status of this application; Figure 20 This is a schematic diagram showing the details of the lever closing limit switch in this application; Figure 21This is a schematic diagram of the dead point position during the lever closing process in this application; Figure 22 This is a schematic diagram of the lever closing state in this application.

[0025] In the diagram: 1. Bracket; 1-1. First side plate; 1-1-1. First jump buckle limiting surface; 1-1-2. Second lock buckle shaft hole one; 1-1-3. First fixed mounting hole; 1-1-4. First lock buckle hole one; 1-1-5. First lever left and right limiting blocks; 1-1-6. First lever rotation center; 1-1-7. First rotating shaft rotation center; 1-1-8. First lower connecting rod shaft limiting surface; 1-1-9. First lever closing limiting surface; 1-1-10. First jump buckle rotation center; 1-1-11. Torsion spring limiting hole; 1-2. Connecting shaft; 1-3. Second side plate; 1-3-1. Second jump buckle Limiting surface; 1-3-2, Second locking shaft hole two; 1-3-3, Second fixed mounting hole; 1-3-4, First locking hole two; 1-3-5, Second lever left and right limiting blocks; 1-3-6, Second lever rotation center; 1-3-7, Second rotating shaft rotation center; 1-3-8, Second lower connecting rod shaft limiting surface; 1-3-9, Second lever closing limiting surface; 1-3-10, Second jump buckle rotation center; 1-3-11, Second locking limiting surface one; 1-3-12, Second locking limiting surface two; 1-3-13, Limiting surface; 2, Second torsion spring; 3, Second locking; 3-1, First mounting hole; 3 -2. First latching contact surface; 3-3. Torsion spring lever positioning contact surface; 3-4. First latch limiting surface; 4. Second latch shaft; 5. Jumper latch; 5-1. Jumper latch rotation center; 5-2. Upper connecting rod rotation center; 5-3. Third jumper latch limiting surface; 5-4. First latching contact surface; 5-5. First latch driving surface; 5-6. Lever contact surface; 6. Tension spring; 7. Lever; 7-1. Second latching contact limiting surface; 7-2. Tension spring mounting shaft; 7-3. Jumper latch driving shaft; 7-4. Lever limiting surface; 7-5. Lever rotation center; 7-6. Handle; 7-7. First closing limiting surface; 8. Lower connecting rod 8-1, First lower connecting rod mounting hole; 8-2, Second closing limit surface; 8-3, Second lower connecting rod mounting hole; 9, Lower connecting rod shaft; 10, Rotating shaft; 10-1, Rotating shaft mounting hole; 10-2, Rotating shaft rotation center; 10-3, Moving contact; 11, Upper connecting rod shaft; 12, Upper connecting rod; 12-1, Upper connecting rod rotation center; 12-2, Third mounting hole; 13, First torsion spring; 14, First locking shaft; 15, First locking; 15-1, Second locking overlapping surface; 15-2, Second locking overlapping surface; 15-3, Second mounting hole; 15-4, Locking driving surface; 15-5, Torsion spring overlapping surface. Detailed Implementation

[0026] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] This application provides a circuit breaker transmission mechanism, whose main function is to realize the circuit breaker's opening, load-bearing energy storage, closing, and tripping protection functions. Through structural innovation, this mechanism enables the moving contact to open and close in both forward and backward directions, thereby significantly increasing the effective length of the arc-extinguishing chamber and making it suitable for high-voltage breaking applications.

[0030] like Figures 1 to 22 As shown, the circuit breaker transmission mechanism includes a bracket 1, and a second torsion spring 2, a second latch 3, a second latch shaft 4, a jumper 5, a tension spring 6, a lever 7, a lower connecting rod 8, a lower connecting rod shaft 9, a rotating shaft 10, an upper connecting rod shaft 11, an upper connecting rod 12, a first torsion spring 13, a first latch shaft 14, and a first latch 15 mounted on the bracket 1. One end of the upper connecting rod 12 is hinged to one end of the lower connecting rod 8 via the upper connecting rod shaft 11, and the other end of the upper connecting rod 12 is rotatably connected to the jumper 5. The other end of the lower connecting rod 8 is hinged to the rotating shaft 10 via the lower connecting rod shaft 9. The jumper 5, lever 7, and rotating shaft 10 are rotatably mounted on the bracket 1. One end of the tension spring 6 is connected to the lever 7, and the other end of the tension spring 6 is connected to the upper connecting rod shaft 11.

[0031] In some embodiments, the bracket 1 adopts a combined structure, including a first side plate 1-1, a second side plate 1-3, and a shaft 1-2 connecting the two; the first side plate 1-1 is provided with a first jump buckle limiting surface 1-1-1, a second locking shaft hole 1-1-2, a first fixed mounting hole 1-1-3, a first locking hole 1-1-4, a first lever left and right limiting block 1-1-5, a first lever rotation center 1-1-6, a first rotating shaft rotation center 1-1-7, a first lower connecting rod shaft limiting surface 1-1-8, a first lever closing limiting surface 1-1-9, and a first jump buckle rotation center 1-1-10. The torsion spring limiting hole 1-1-11; the second side plate 1-3 is provided with the second jump buckle limiting surface 1-3-1, the second locking shaft hole 2 1-3-2, the second fixed mounting hole 1-3-3, the first locking hole 2 1-3-4, the second lever left and right limiting blocks 1-3-5, the second lever rotation center 1-3-6, the second rotating shaft rotation center 1-3-7, the second lower connecting rod shaft limiting surface 1-3-8, the second lever closing limiting surface 1-3-9, the second jump buckle rotation center 1-3-10, the second locking limiting surface 1-3-11, the second locking limiting surface 2 1-3-12, and the limiting surface 1-3-13. During assembly, the first fixing mounting hole 1-1-3 of the first side plate 1-1 passes through one end of the connecting shaft 1-2, and the second fixing mounting hole 1-3-3 of the second side plate 1-3 passes through the other end of the connecting shaft 1-2. They are fixed by riveting or pressing, thereby forming a stable frame bracket 1.

[0032] In some embodiments, the first lever rotation center 1-1-6 and the second lever rotation center 1-3-6 are coaxial, and a lever 7 is installed thereon. The lever 7 is located between the left and right limit blocks 1-1-5 of the first lever and the left and right limit blocks 1-3-5 of the second lever; the first rotating shaft rotation center 1-1-7 and the second rotating shaft rotation center 1-3-7 are coaxial, and a rotating shaft 10 is installed thereon; the first jump buckle rotation center 1-1-10 and the second jump buckle rotation center 1-3-10 are coaxial, and a jump buckle 5 is installed thereon.

[0033] After assembly, the first lever rotation center 1-1-6 of the first side plate 1-1 is coaxial with the second lever rotation center 1-3-6 of the second side plate 1-3, and is used to install the lever 7; the first shaft rotation center 1-1-7 of the first side plate 1-1 is coaxial with the second shaft rotation center 1-3-7 of the second side plate 1-3, and is used to install the shaft 10; the first jump buckle rotation center 1-1-10 of the first side plate 1-1 is coaxial with the second jump buckle rotation center 1-3-10 of the second side plate 1-3, and is used to install the jump buckle 5.

[0034] In some embodiments, the first jump buckle limiting surface 1-1-1 and the second jump buckle limiting surface 1-3-1 are arranged opposite to each other and are adapted to the jump buckle 5. In this embodiment, the jump buckle 5 can rotate within the first jump buckle rotation center 1-1-10 and the second jump buckle rotation center 1-3-10. When the jump buckle 5 rotates to its limit position, the first jump buckle limiting surface 1-1-1 and the second jump buckle limiting surface 1-3-1 are adapted to the jump buckle 5, and the first jump buckle limiting surface 1-1-1 and the second jump buckle limiting surface 1-3-1 abut against the jump buckle 5 to limit the rotation angle of the jump buckle 5.

[0035] In some embodiments, the first lower connecting rod shaft limiting surface 1-1-8 and the second lower connecting rod shaft limiting surface 1-3-8 are opposite to each other and are adapted to the lower connecting rod shaft 9; the rotation center of the upper connecting rod 12 abuts against the rotation center of the jump buckle 5; one end of the tension spring 6 is installed on the lever 7 and the other end is installed on the upper connecting rod shaft 11, the upper connecting rod shaft 11 passes through the lower connecting rod 8 and the upper connecting rod 12, and the lower connecting rod shaft 9 passes through the lower connecting rod 8 and the rotating shaft 10; the second locking shaft hole 1-1-2 and the second locking shaft hole 2-3-2 are coaxial and a second locking shaft 4 is installed thereon, and the second lock 3 is installed on the second locking shaft 4.

[0036] In this embodiment, in the disengaged state, the first lower connecting rod shaft limiting surface 1-1-8 and the second lower connecting rod shaft limiting surface 1-3-8 abut against the lower connecting rod shaft 9 to limit the position of the lower connecting rod shaft 9. The tension spring 6 is stretched to store energy, and under the force of the tension spring 6, the lower connecting rod shaft 9 abuts against the first lower connecting rod shaft limiting surface 1-1-8 and the second lower connecting rod shaft limiting surface 1-3-8.

[0037] In some embodiments, the first lever closing limit surface 1-1-9 and the second lever closing limit surface 1-3-9 are disposed opposite to each other and are adapted to the lever 7. In this embodiment, in the closed state, the first lever closing limit surface 1-1-9 and the second lever closing limit surface 1-3-9 abut against the lever 7 to limit the closing limit position of the lever 7.

[0038] In some embodiments, the second latch limiting surface 1-3-11 and the second latch limiting surface 1-3-12 are adapted to the second latch 3. The second latch limiting surface 1-3-11 and the second latch limiting surface 1-3-12 are respectively used to limit the clockwise rotation limit and the counterclockwise rotation limit of the second latch 3, realizing bidirectional limiting of the second latch 3, preventing the second latch 3 from malfunctioning or overtravel and overturning under vibration or impact, and improving the reliability of the circuit breaker.

[0039] The bracket 1 provided in this application adopts a combined structure of a first side plate 1-1, a second side plate 1-3, and a connecting shaft 1-2. Each component can be processed separately and then assembled, reducing mold complexity and manufacturing costs. Furthermore, multiple limiting surfaces are integrated on the first side plate 1-1 and the second side plate 1-3, achieving precise limiting of each moving part in the transmission mechanism without the need for additional limiting parts, reducing accumulated assembly errors. It has the advantages of simple structure, convenient assembly, reliable limiting, and low manufacturing cost, and is suitable for the transmission mechanism of high-voltage circuit breakers. In addition, the rotation centers on the first side plate 1-1 and the second side plate 1-3 are coaxially aligned, ensuring the coaxiality of components such as the jumper 5, lever 7, and rotating shaft 10, improving the consistency of the transmission mechanism's operation.

[0040] In some embodiments, the first latch 15 is rotatably mounted on the bracket 1 via the first latch shaft 14, the second latch 3 is rotatably mounted on the bracket 1 via the second latch shaft 4, and the jumper 5 is rotatably mounted on the bracket 1; the second latch 3 is provided with a first mounting hole 3-1, a first latch lap surface 3-2, a torsion spring force arm positioning lap surface 3-3, and a first latch limiting surface 3-4; the second latch 3 is mounted on the bracket 1 via the second latch shaft 4 passing through the first mounting hole 3-1.

[0041] Optionally, the first latching limiting surface 3-4 of the second latch 3 abuts against the second latching limiting surface 1-3-11 of the second side plate 1-3 during the latching process, thereby limiting the extreme position of the second latch 3.

[0042] In some embodiments, the jump buckle 5 is provided with a jump buckle rotation center 5-1, an upper connecting rod rotation center 5-2, a third jump buckle limiting surface 5-3, a first buckle overlapping surface 5-4, a first locking driving surface 5-5, and a lever overlapping surface 5-6; the jump buckle rotation center 5-1 of the jump buckle 5 is installed on the first jump buckle rotation center 1-1-10 of the first side plate 1-1 and the second jump buckle rotation center 1-3-10 of the second side plate 1-3.

[0043] In some embodiments, the first latch 15 is provided with a second latch lap surface 15-1, a second carrier latch lap surface 15-2, a second mounting hole 15-3, a carrier latch driving surface 15-4, and a torsion spring lap surface 15-5; the first latch 15 is mounted on the bracket 1 through the second mounting hole 15-3 via the first latch shaft 14.

[0044] In the buckle-on state, the second buckle overlap surface 15-1 of the first buckle 15 abuts against the first buckle overlap surface 3-2 of the second buckle 3, and the first buckle overlap surface 5-4 of the jump buckle 5 abuts against the second buckle overlap surface 15-2 of the first buckle 15, forming a three-level sequential locking mechanical transmission path of "jump buckle - first buckle - second buckle".

[0045] During the fastening process, the first fastening driving surface 5-5 of the jump buckle 5 abuts against the fastening driving surface 15-4 of the first fastening 15, driving the first fastening 15 to rotate clockwise.

[0046] In some embodiments, the first locking shaft 14 passes through the first locking hole 1-1-4, the first locking hole 2 1-3-4 and the first lock 15. The first torsion spring 13 is sleeved on the first locking shaft 14. The fixing arm of one end of the first torsion spring 13 abuts against the torsion spring limiting hole 1-1-11 of the first side plate 1-1, and the applying arm of the other end of the first torsion spring 13 abuts against the torsion spring overlapping surface 15-5 of the first lock 15, providing the first lock 15 with the torque to rotate counterclockwise.

[0047] In some embodiments, the second torsion spring 2 is sleeved on the second locking shaft 4, and the fixing arm of one end of the second torsion spring 2 overlaps with the limiting surface 1-3-13 of the second side plate 1-3, and the applying arm of the other end of the second torsion spring 2 overlaps with the torsion spring applying arm positioning overlap surface 3-3 provided on the second locking 3, so as to provide the second locking 3 with the torque to rotate counterclockwise.

[0048] In some embodiments, the third jump buckle limiting surface 5-3 of the jump buckle 5 overlaps with the first jump buckle limiting surface 1-1-1 of the first side plate 1-1 and the second jump buckle limiting surface 1-3-1 of the second side plate 1-3, thereby limiting the initial position of the jump buckle 5. The lever contact surface 5-6 of the jump buckle 5 abuts against the lever 7 and receives the driving force of the lever 7; the upper connecting rod rotation center 5-2 of the jump buckle 5 abuts against the upper connecting rod 12.

[0049] The fastening process is as follows: A counterclockwise torque is applied to lever 7, causing lever 7 to drive the jump buckle 5 to rotate clockwise around the jump buckle rotation center 5-1. The first locking drive surface 5-5 of the jump buckle 5 abuts against the mounting drive surface 15-4 of the first lock 15, causing the first lock 15 to rotate clockwise. The second locking contact surface 15-1 of the first lock 15 is higher than the first locking contact surface 3-2 of the second lock 3. The first mounting limiting surface 3-4 of the second lock 3 rotates under the counterclockwise rotation torque provided by the second torsion spring 2 until it abuts against the second locking limiting surface 1-3-11 of the second side plate 1-3. During this process, the tension spring 6 is stretched to store energy.

[0050] The counterclockwise torque applied to lever 7 is removed, and lever 7 rotates clockwise under the stored capacity of tension spring 6, while the jump buckle 5 rotates counterclockwise. The first latching drive surface 5-5 of jump buckle 5 disengages from the latching drive surface 15-4 of the first latch 15, and the first latch 15 rotates under the counterclockwise rotational torque provided by the first torsion spring 13 until its second latching contact surface 15-1 abuts against the first latching contact surface 3-2 of the second latch 3. The first latching contact surface 5-4 of jump buckle 5 abuts against the second latching contact surface 15-2 of the first latch 15. At this time, jump buckle 5 locks with the first latch 15, and the first latch 15 locks with the second latch 3, thus realizing the latching of this transmission mechanism.

[0051] In the latched state, a three-level locking mechanical transmission path is formed: "Jump Lock 5 - First Lock 15 - Second Lock 3". Specifically: the first latching contact surface 5-4 of Jump Lock 5 abuts against the second latching contact surface 15-2 of First Lock 15 (first-level locking); the second latching contact surface 15-1 of First Lock 15 abuts against the first latching contact surface 3-2 of Second Lock 3 (second-level locking); and Second Lock 3 abuts against the limiting surface 1-3-11 of Bracket 1 via the first latching limiting surface 3-4 (third-level locking). The three-level locking is interlocked, and failure of any one level of locking will not immediately cause the entire latch to disengage, thus greatly improving the reliability of the latching mechanism.

[0052] In the event of a faulty trip, drive the first latch 15 or the second latch 3 to rotate, causing the second latching surface 15-1 of the first latch 15 to disengage from the first latching surface 3-2 of the second latch 3, or causing the second latching surface 15-2 of the first latch 15 to disengage from the first latching surface 5-4 of the jump latch 5, thereby releasing the three levels of locking in sequence, releasing the jump latch 5, and achieving tripping.

[0053] Therefore, this application adopts a three-stage locking structure of "jump lock - first lock - second lock". Even if one lock becomes loose due to wear or vibration, the other two locks can still remain locked, greatly improving the reliability of the tripping mechanism. The double-locking structure of this application, combined with the stable torque provided by the torsion spring, ensures that the locking surfaces always maintain tight contact, effectively resisting external vibration and impact, preventing accidental tripping, and exhibiting excellent vibration resistance. This application establishes a clear mechanical transmission path through three-stage locking, facilitating design calculations and fault analysis. In the event of a fault, the external trip unit only needs to drive the first or second lock to rotate, sequentially releasing the three-stage locking. The tripping action is sensitive and reliable. The first and second locks of this application are arranged in a stacked manner, making full use of the internal space of the bracket without increasing the volume of the transmission mechanism, resulting in a compact structure.

[0054] In some embodiments, the lever 7 is provided with a second latch limiting surface 7-1, a tension spring mounting shaft 7-2, a trip lever driving shaft 7-3, a lever limiting surface 7-4, a lever rotation center 7-5, a handle 7-6, and a first closing limiting surface 7-7; one end of the tension spring 6 is connected to the tension spring mounting shaft 7-2 of the lever 7; the lever 7 is rotatably mounted on the bracket 1 through the lever rotation center 7-5; the handle 7-6 is used to receive the closing or opening torque applied by the operator; the trip lever driving shaft 7-3 is used to abut against the trip lever 5 and drive the trip lever 5 to rotate during the closing process.

[0055] In some embodiments, the lower connecting rod 8 has a first lower connecting rod mounting hole 8-1 and a second lower connecting rod mounting hole 8-3 at both ends, and a second closing limiting surface 8-2 on the side. The first lower connecting rod mounting hole 8-1 is used to install the upper connecting rod shaft 11, and the second lower connecting rod mounting hole 8-3 is used to install the lower connecting rod shaft 9. The second closing limiting surface 8-2 cooperates with the connecting shaft 1-2.

[0056] In some embodiments, one end of the upper connecting rod 12 is provided with a third mounting hole 12-2, and the other end is provided with an upper connecting rod rotation center 12-1. The third mounting hole 12-2 is used to cooperate with the upper connecting rod shaft 11 so that the upper connecting rod 12 is hinged to the lower connecting rod 8. The upper connecting rod rotation center 12-1 is used to abut against the jump buckle 5 so that the upper connecting rod 12 and the jump buckle 5 form a rotatable connection.

[0057] The closing process is as follows: A clockwise torque is applied to the handle 7-6 of lever 7, rotating the first closing limit surface 7-7 of lever 7 until it abuts against bracket 1. During this process, tension spring 6 moves with lever 7, and the center line D of tension spring 6 will rotate through the line C connecting the rotation center 12-1 of the upper connecting rod and the third mounting hole 12-2. This process is when tension spring 6 passes the "dead point" between the upper connecting rod 12 and tension spring 6.

[0058] After passing the dead point, under the force of the tension spring 6, the upper connecting rod 12, the upper connecting rod shaft 11, and the lower connecting rod 8 rotate counterclockwise. The second closing limit surface 8-2 of the lower connecting rod 8 abuts against the connecting shaft 1-2, realizing the rotation limit of the lower connecting rod 8. The lower connecting rod 8 drives the rotating shaft 10 to rotate clockwise through the lower connecting rod shaft 9, causing the moving contact 10-3 set on the rotating shaft 10 to rotate from position A to position B, contacting the stationary contact of the circuit breaker, realizing the closing function of the transmission mechanism.

[0059] It should be noted that after the tension spring 6 passes the dead point, the direction of its tension changes relative to the rotation center of the upper connecting rod 12, generating a continuous counterclockwise torque acting on the upper connecting rod 12 and the lower connecting rod 8. This torque can resist contact bounce and external vibration, keeping the moving contact 10-3 stably in the closed position without the need for an additional locking mechanism.

[0060] Meanwhile, the second closing limit surface 8-2 on the lower connecting rod 8 abuts against the connecting shaft 1-2 of the bracket 1, precisely limiting the rotation limit position of the lower connecting rod 8, thereby precisely controlling the closing angle of the rotating shaft 10 and the closing position of the moving contact 10-3. This design effectively overcomes the influence of part machining tolerances and cumulative assembly errors on the accuracy of the closing position.

[0061] Therefore, this application utilizes a "dead-end point" structure where the centerline of the tension spring crosses the line connecting the rotation center of the upper connecting rod and the third mounting hole, thus changing the direction of the tension spring's force. This provides a continuous counterclockwise torque to the upper and lower connecting rods, maintaining the closed state without the need for an additional locking mechanism. The structure is simple and reliable, achieving self-holding during closing. The lower connecting rod has a second closing limit surface, which abuts against the connecting shaft of the bracket in the closed state, achieving precise control of the lower connecting rod's rotational limit position. This ensures the consistency of the moving contact's closing position and the stability of the contact pressure, resulting in accurate closing. Furthermore, this linkage transmission mechanism directly connects the tension spring between the lever and the upper connecting rod shaft. The spring force directly drives the upper and lower connecting rods through the upper connecting rod shaft, resulting in a short transmission path, low energy loss, and high transmission efficiency. In addition, this linkage transmission mechanism, through the cooperation of the upper and lower connecting rods and the rotating shaft, enables the moving contact to swing back and forth, arranging the arc-extinguishing space along its length, significantly increasing the arc-extinguishing capacity and making it suitable for high-voltage breaking applications.

[0062] In some embodiments, the rotating shaft 10 is provided with a rotating shaft mounting hole 10-1, a rotating shaft rotation center 10-2, and a moving contact 10-3; the rotating shaft rotation center 10-2 abuts against the first rotating shaft rotation center 1-1-7 of the first side plate 1-1 and the second rotating shaft rotation center 1-3-7 of the second side plate 1-3; the lower connecting rod shaft 9 passes through the second lower connecting rod mounting hole 8-3 and the rotating shaft mounting hole 10-1 to realize the rotational connection between the rotating shaft 10 and the lower connecting rod 8.

[0063] In the tripped state, under the force of the tension spring 6, the lower connecting rod shaft 9 abuts against the first lower connecting rod shaft limiting surface 1-1-8 of the first side plate 1-1 and the second lower connecting rod shaft limiting surface 1-3-8 of the second side plate 1-3. Since the lower connecting rod shaft 9 is connected to the lower connecting rod 8, and the lower connecting rod 8 is connected to the rotating shaft 10, the abutment between the lower connecting rod shaft 9 and the limiting surface indirectly restricts the opening limit position of the rotating shaft 10. At this time, the moving contact 10-3 is located in position A (open position).

[0064] The lower connecting rod 8 is equipped with a closing limit surface 8-2. During the closing process, a clockwise torque is applied to the lever 7, and under the force of the tension spring 6, the upper connecting rod 12 and the upper connecting rod shaft 11 rotate counterclockwise with the lower connecting rod 8. The closing limit surface 8-2 of the lower connecting rod 8 abuts against the shaft 1-2 of the bracket 1, thereby limiting the rotation of the lower connecting rod 8. The lower connecting rod 8 drives the rotating shaft 10 to rotate clockwise through the lower connecting rod shaft 9, causing the moving contact 10-3 to rotate from position A to position B (the closing position).

[0065] In this embodiment, the opening and closing limit positions of the rotating shaft 10 are precisely controlled through the following two-stage limit structure: First-level limit (opening limit): The lower connecting rod shaft 9 abuts against the first lower connecting rod shaft limiting surface 1-1-8 of the first side plate 1-1 and the second lower connecting rod shaft limiting surface 1-3-8 of the second side plate 1-3, indirectly limiting the opening position of the rotating shaft 10. Since the lower connecting rod shaft limiting surface is directly set on the side plate of the bracket 1 and is an integral structure with the bracket 1, the assembly error of independent limiting parts in the traditional structure is eliminated, and the repeatability accuracy of the opening position is effectively guaranteed.

[0066] The second-level limit (closing limit): The closing limit surface 8-2 of the lower connecting rod 8 abuts against the connecting shaft 1-2 of the bracket 1, limiting the rotation limit position of the lower connecting rod 8, thereby indirectly limiting the closing position of the rotating shaft 10. The connecting shaft 1-2 also serves as a connecting part of the bracket 1, achieving multiple uses and a compact structure.

[0067] The first lower connecting rod shaft limiting surface 1-1-8 and the second lower connecting rod shaft limiting surface 1-3-8 on the first side plate 1-1 and the second side plate 1-3 can be designed as planes, forming line contact with the circumferential surface of the lower connecting rod shaft 9, which helps to ensure the consistency of the limiting position. Alternatively, they can be designed as arc-shaped surfaces that match the outer circumference of the lower connecting rod shaft 9, increasing the contact area and reducing contact stress.

[0068] The swing angle of the rotating shaft 10 is jointly defined by the first lower connecting rod shaft limiting surface 1-1-8, the second lower connecting rod shaft limiting surface 1-3-8, and the closing limiting surface 8-2, and the angle range is precisely controllable. The moving contact 10-3 contacts the stationary contact (not shown in the figure) in the closed position. The accuracy of the closing position of the rotating shaft 10 directly affects the contact pressure between the moving and stationary contacts, thus affecting the contact resistance and temperature rise performance of the circuit breaker. This application effectively ensures the stability and consistency of the contact pressure through a precise rotating shaft limiting structure.

[0069] Therefore, this application eliminates assembly errors of the limiting parts by directly setting the lower connecting rod shaft limiting surface on the first and second side plates. The lower connecting rod shaft limiting surface is an integral structure with the bracket body. The lower connecting rod shaft directly abuts against the lower connecting rod shaft limiting surface, and the opening position of the rotating shaft is precisely controlled through the transmission of the lower connecting rod, resulting in high opening position accuracy. In the closing state, the closing limiting surface of the lower connecting rod abuts against the connecting shaft of the bracket. The connecting shaft serves as both a connecting part of the bracket and a closing limiting reference, achieving multi-functional integration. The closing position accuracy is guaranteed by the dimensional accuracy of the lower connecting rod and the bracket, resulting in high repeatability and high closing position accuracy. Because the opening and closing position accuracy of the rotating shaft is effectively controlled, the contact pressure between the moving contact and the stationary contact remains stable in the closing position, which is beneficial to improving the current-carrying performance and electrical life of the circuit breaker, and the contact pressure is stable. The limiting surface is integrated into the side plate of the bracket, eliminating the need for additional independent limiting parts, reducing the number of parts and assembly processes, lowering manufacturing costs, and simplifying the structure. The extreme positions of the rotating shaft are directly or indirectly determined by the limiting surface on the side plate of the bracket. No adjustment is required during maintenance, ensuring positional consistency during long-term use and making maintenance convenient.

[0070] The circuit breaker transmission mechanism provided in this application has the following loading and unloading process: a counterclockwise torque is applied to the handle 7-6 of lever 7, causing the tripping drive shaft 7-3 of lever 7 to drive tripping 5 to rotate clockwise around the tripping rotation center 5-1. The lever limiting surface 7-4 of lever 7 abuts against the limiting surface 1-3-13 of the second side plate 1-3. The first locking drive surface 5-5 of tripping 5 abuts against the loading and unloading drive surface 15-4 of the first locking 15, causing the first locking 15 to rotate clockwise. The locking overlap surface 15-1 of the first locking 15 is higher than the first locking overlap surface 3-2 of the second locking 3. The first loading and unloading limiting surface 3-4 of the second locking 3 rotates under the counterclockwise rotation torque provided by the second torsion spring 2 to abut against the second locking limiting surface 1-3-11 of the second side plate 1-3. During this process, the tension spring 6 is stretched and stores energy. The counterclockwise torque applied to the handle 7-6 of lever 7 is removed. Lever 7 rotates clockwise under the stored capacity of tension spring 6, while the jump buckle 5 rotates counterclockwise. The first latching drive surface 5-5 of jump buckle 5 disengages from the latching drive surface 15-4 of the first latch 15. Under the counterclockwise rotational torque provided by the first torsion spring 13, the first latch 15 rotates until its second latching contact surface 15-1 abuts against the first latching contact surface 3-2 of the second latch 3. The first latching contact surface 5-4 of jump buckle 5 abuts against the second latching contact surface 15-2 of the first latch 15, thus locking jump buckle 5 with the first latch 15 and the first latch 15 with the second latch 3. The mechanism is thus latched.

[0071] The closing process of the circuit breaker transmission mechanism provided in this application is as follows: With the mechanism in the loaded state, a clockwise torque is applied to the handle 7-6 of lever 7, rotating the first closing limiting surface 7-7 of lever 7 to abut against the second lever closing limiting surface 1-3-9 of the second side plate 1-3. During this process, the center line D of tension spring 6 rotates past the line C connecting the upper connecting rod rotation center 12-1 and the third mounting hole 12-2 (i.e., tension spring 6 passes the dead point of the upper connecting rod 12 and tension spring 6). Under the force of tension spring 6, the upper connecting rod 12, the upper connecting rod shaft 11, and the lower connecting rod 8 rotate counterclockwise, and the second closing limiting surface 8-2 of the lower connecting rod 8 abuts against the connecting shaft 1-2, thus limiting the rotation of the lower connecting rod 8. The lower connecting rod 8 drives the rotating shaft 10 to rotate clockwise through the lower connecting rod shaft 9, causing the moving contact 10-3 to rotate from position A to position B, thereby realizing the closing function of the transmission mechanism.

[0072] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A circuit breaker transmission mechanism, characterized in that, include: The bracket (1), the second latch (3), the jumper (5), the lever (7), the upper connecting rod (12), the lower connecting rod (8), the rotating shaft (10) and the first latch (15) are rotatably mounted on the bracket (1); one end of the upper connecting rod (12) is hinged to one end of the lower connecting rod (8) through the upper connecting rod shaft (11), the other end of the upper connecting rod (12) is rotatably connected to the jumper (5), and the other end of the lower connecting rod (8) is hinged to the rotating shaft (10) through the lower connecting rod shaft (9); A tension spring (6) is connected at one end to a lever (7) and at the other end to an upper connecting rod shaft (11); The jump buckle (5), the first locking buckle (15), and the second locking buckle (3) form a three-level sequential locking mechanical transmission path in the loaded state, wherein: The first buckle lap surface (5-4) of the jump buckle (5) abuts against the second buckle lap surface (15-2) of the first lock buckle (15) to form a first-level lock; The second latching surface (15-1) of the first latch (15) abuts against the first latching surface (3-2) of the second latch (3) to form a second-level lock; The first buckle limiting surface (3-4) of the second buckle (3) abuts against the second buckle limiting surface (1-3-11) on the bracket (1) to form a third-level lock.

2. The circuit breaker transmission mechanism according to claim 1, characterized in that, The bracket (1) includes a first side plate (1-1), a second side plate (1-3), and a connecting shaft (1-2) connecting the two. The bracket (1) is equipped with multiple limiting surfaces for limiting the movement of components. These multiple limiting surfaces include: The first lower connecting rod shaft limiting surface (1-1-8) and the second lower connecting rod shaft limiting surface (1-3-8) are provided on the first side plate (1-1) and the second side plate (1-3). In the tripped state, the lower connecting rod shaft (9) passing through the lower connecting rod (8) and the rotating shaft (10) abuts against the first lower connecting rod shaft limiting surface (1-1-8) and the second lower connecting rod shaft limiting surface (1-3-8) to limit the tripping limit position of the rotating shaft (10).

3. The circuit breaker transmission mechanism according to claim 2, characterized in that, The plurality of limiting surfaces also include: The second closing limit surface (8-2) is provided on the lower connecting rod (8). In the closed state, the second closing limit surface (8-2) abuts against the connecting shaft (1-2) of the bracket (1) to limit the closing limit position of the rotating shaft (10).

4. The circuit breaker transmission mechanism according to claim 2, characterized in that, The plurality of limiting surfaces also include: The first lever closing limit surface (1-1-9) and the second lever closing limit surface (1-3-9) are provided on the first side plate (1-1) and the second side plate (1-3). In the closed state, the first closing limit surface (7-7) of the lever (7) abuts against the first lever closing limit surface (1-1-9) and the second lever closing limit surface (1-3-9).

5. The circuit breaker transmission mechanism according to claim 2, characterized in that, The plurality of limiting surfaces also include: The first jump buckle limiting surface (1-1-1) and the second jump buckle limiting surface (1-3-1) are provided on the first side plate (1-1) and the second side plate (1-3). The third jump buckle limiting surface (5-3) provided on the jump buckle (5) abuts against the first jump buckle limiting surface (1-1-1) and the second jump buckle limiting surface (1-3-1) to limit the initial position of the jump buckle (5).

6. The circuit breaker transmission mechanism according to claim 1, characterized in that, The buckle (5) is provided with a lever contact surface (5-6) for abutting against the lever (7) and receiving the driving force of the lever (7). During the closing process, the lever (7) drives the tension spring (6) to move, so that the center line (D) of the tension spring (6) crosses the line (C) connecting the upper link rotation center (12-1) of the upper link (12) and the third mounting hole (12-2), thereby the tension of the tension spring (6) provides a continuous torque for the upper link (12) and the lower link (8) to maintain the closing state.

7. The circuit breaker transmission mechanism according to claim 2, characterized in that, The first side plate (1-1) is provided with a first lever left and right limiting block (1-1-5), and the second side plate (1-3) is provided with a second lever left and right limiting block (1-3-5). The lever (7) is rotatably installed between the first side plate (1-1) and the second side plate (1-3) and is limited between the first lever left and right limiting block (1-1-5) and the second lever left and right limiting block (1-3-5).

8. The circuit breaker transmission mechanism according to claim 2, characterized in that, The second side plate (1-3) is also provided with a second latch limiting surface two (1-3-12) adapted to the second latch (3). The second latch limiting surface one (1-3-11) and the second latch limiting surface two (1-3-12) are respectively used to limit the rotation limit of the second latch (3) in two directions.

9. The circuit breaker drive mechanism according to any one of claims 1 to 8, characterized in that, The jump buckle (5) is also provided with a first buckle driving surface (5-5), and the first buckle (15) is provided with a buckle driving surface (15-4). During the fastening process, the lever (7) drives the buckle (5) to rotate, and the first buckle driving surface (5-5) abuts against the fastening driving surface (15-4) to drive the first buckle (15) to rotate, so that the second buckle overlapping surface (15-1) of the first buckle (15) moves to a position higher than the first buckle overlapping surface (3-2) of the second buckle (3).

10. The circuit breaker drive mechanism according to any one of claims 1 to 8, characterized in that, It also includes a first torsion spring (13) and a second torsion spring (2); The first latch (15) is rotatably mounted on the bracket (1) via the first latch shaft (14); the first torsion spring (13) is sleeved on the first latch shaft (14), and the fixing arm of one end of the first torsion spring (13) abuts against the torsion spring limiting hole (1-1-11) provided on the bracket (1), and the applying arm of the other end abuts against the torsion spring overlapping surface (15-5) provided on the first latch (15) to drive the first latch (15) to rotate; The second latch (3) is rotatably mounted on the bracket (1) via the second latch shaft (4); the second torsion spring (2) is sleeved on the second latch shaft (4), and the fixing arm of one end of the second torsion spring (2) overlaps with the limiting surface (1-3-13) provided by the bracket (1), and the applying arm of the other end overlaps with the torsion spring applying arm positioning overlap surface (3-3) provided by the second latch (3) to drive the second latch (3) to rotate; A moving contact (10-3) is provided on the rotating shaft (10). The moving contact (10-3) swings between the open position and the closed position with the rotating shaft (10). The opening and closing movement direction of the moving contact (10-3) is arranged along the length direction of the arc extinguishing space of the circuit breaker.

Images